Just thought I would mention that if anyone has been on the fence about getting one of these then I would say go for it. I have a late 2012 base model (2.5 GHz i5) that I got brand new a few months before the refresh of these systems on sale for $500 at a local electronics store. They are great upgradable units with a solid amount of connectivity and a portable design. I currently use my i5 as my daily desktop computer with an 8GB RAM upgrade and plan to run through the mechanical stock drive until it's time to upgrade with a SSD and repurpose the stock drive as an external.
These machines are great, they are very cool and quiet (even with the mechanical drive) and can accomplish much with all of the connectivity and expandability. You can even purchase a kit from OWC to install a second HDD in these little units for storage or even a RAID setup if you can get it working.
I wanted to posted this because I was on the fence years ago of whether or not to purchase one of these. I don't see any at the moment on the Refurbished/Clearance outlet, but if you have been considering a Mac Mini and another 2012 model pops up on there, I wouldn't hesitate to grab it. The 2014 models have an identical design on the outside, but it is what is on the inside that matters, and the new lower price point on those models is all smoke and mirrors due to soldered RAM modules.
Cheers!